iOS How to detect focus change between textfields in custom keyboard? - ios

I am making a custom keyboard and i want to change my keyboard layout to adapt to the UITextField type (url, websearch, email) every time user change the focus between textfields.
For example:
Beginning, user inputs in url textfield, my keyboard will show a dot button.
After finished the editing in url textfield, user focus on email textfield, my keyboard will replace a dot button by # button.
The question is how to catch this even in custom keyboard?

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Here the screen :
Just use UIScrollView in your dialog box, and set scroll view class TPKAScrollViewController. Download class
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So far so good EXCEPT the cursor doesn't blink in the either of the two TextFields until they are selected. If I just begin typing without selecting, the first textfield is filled. That's OK, but I would like to set the cursor flashing in that field so the user is notified that that is where the input will go unless they select the other field.
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...Dale
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